Are There Any Foundations Where A Water Well Can't Be Drilled?

Are there any foundations where a water well can't be drilled? Water wells can be drilled through rock, granite, marble, limestone, and sand with varying degrees of difficulty. No. We can drill through...

No. We can drill through anything. It's not always easy, but we can. The hardest formations are the granites, the marbles, and dolomite. The dolomite is a layer kind of like limestone, but it's harder than granite. That's pretty much the hardest stuff we find. We can easily drill 200-300 feet per day through it, though. The equipment we use now is extremely expensive and extremely powerful.

The price typically goes up with a harder foundation. Most of the wells that I drill have very soft limestone. I can drill 1000 feet in one day. However, when I go to an area that has granite, I can only drill 200 feet in a day. I charge about three times the price to drill that well. It takes a lot more fuel, and I have to spend a lot more time on the site.

Limestone foundations are usually the best. Most of them cut pretty easily, and you don't have to worry about them caving in on you. The big problems are overburden and sand. Overburdens are boulders the size of a car. As you drill through the layer, the boulder won't actually get drilled. It just moves. You're actually drilling between the boulders. When you pull your drill out it's like you never did anything. Sand is the same way. When you pull the drill out, the sand will fill back into the hole. That's why when you dig a hole at the beach, the deeper you dig, the wider you have to dig to keep it from collapsing. Imagine doing that for 300 feet. There are special things we can do to stop it from happening, but it takes more time and costs more money.

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